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Envision flex high ph kit

Manufactured by Agilent Technologies
Sourced in Denmark, United States

The EnVision FLEX High pH kit is a laboratory reagent designed for immunohistochemistry (IHC) applications. It provides a high pH antigen retrieval solution to facilitate the unmasking of antigenic epitopes, which is a crucial step in the IHC process. The kit's core function is to assist in the pretreatment of tissue samples, preparing them for subsequent immunostaining and analysis.

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24 protocols using envision flex high ph kit

1

Immunohistochemical Analysis of Kidney Pathways

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BTBRob/ob and wild type mice kidneys were fixed with formalin (10%) and sectioned at 3–4 µm thick. IHC reaction was performed with EnVision FLEX High pH kit (#K8000—DAKO, Carpinteria, CA, USA). Scoring for WT-1+ cells was carried out by counting the number of positive nuclei in 25 glomeruli randomly chosen in kidney cortexes and outer medulla sections using 10× magnification and after applying a rabbit polyclonal WT-1 antibody (anti-WT1; #sc-192—Santa Cruz, Dallas, TX, USA). Data from all fields and all kidneys were pooled to obtain the number of WT-1+ podocytes per glomerular cross-section. For autophagy induction, quantification of LC3 (anti-LC3; #4445S—Cell Signaling, Danvers, MA, USA) was performed analyzing cortex and medulla regions. For apoptosis pathway analysis, we evaluated caspase-3 and cleaved caspase-3 (#9662; #9661—Cell Signaling, Danvers, MA, USA) protein activation. Oxidative stress was measured by 4-HNE staining (anti-4-hydroxynonenal polyclonal antibody; #ab46545—Abcam, Cambridge, MA, USA) in kidney sections. The intensity of staining was determined using the optical density function of CellSens software (Olympus). Tissue sections were counter-stained with Mayer’s hemalum.
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2

Immunohistochemical Localization of Collagen III

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For immunohistochemical localization of collagen type III, 4 µm thick cartilage sections were pre-treated (deparaffinization, rehydration and epitope retrieval) using the EnVisionFlex High pH-Kit (DAKO, Copenhagen, Denmark) and then stained in an Autostainer Plus (DAKO; Glostrup, Copenhagen, Denmark) with the mAb 4G9 antibody diluted 1:1000.
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3

Breast Cancer Cohort Immunohistochemistry Protocol

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The breast cancer cohort consists of 144 patients diagnosed with invasive breast cancer at Skåne University Hospital, Malmö, Sweden, between 2001 and 2002. The cohort and TMA have previously been described in detail19 (link)52 (link)53 (link). CXCL16 cytoplasmic expression was estimated in the malignant cells (intensity: 0=negative, 1= weak, 2=moderate, 3=strong intensity) and in the stromal fibroblasts (intensity 0=negative-weak, 1=strong intensity). Sections (4 μm thick) of the paraffin embedded tumours were mounted onto glass slides and deparaffinized, prior to antigen retrieval using the PT-link system (DAKO, Glostrup, Denmark) and staining in a Autostainer Plus (DAKO) with the EnVisionFlex High pH-kit (DAKO). All histological sections were counterstained with HE. All primary antibodies used for IHC are shown in Supplementary Table 4 (specificity; clone; dilution; company). Sirius Red staining was performed using in house methods. Cytospins were prepared from monocytes or non-enzymatic cell dissociation buffer-collected (Sigma Aldrich) M2 cultures that were air-dried.
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4

Histochemical Analyses of Skeletal, Cardiac, and Liver Tissues

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Histochemical analyses of skeletal and cardiac muscle were performed on fresh-frozen tissue specimens and formalin-fixed, paraffin-embedded liver specimens. Eight-μm-thick cryostat sections were fixed in acetone for 10 minutes and washed in TRIS-buffered saline-Tween for 10 minutes; 5-μm-thick paraffin sections were used without fixation. The specimens were stained with periodic acid–Schiff (PAS) reagent using a standard protocol to determine the presence of glycogen (17 ). Immunohistochemical detection of free glycogenin-1 (M07 clone 3B5; Abnova, 1:500) and glycogenin-2 (HPA005495; Atlas Antibodies, 1:100) was performed using a Dako Autostainer and using the Dako EnVision FLEX High pH kit according to the manufacturer’s standard protocol. Primary antibodies were applied for 1 hour. The Dako Liquid DAB+ Substrate Chromogen System was used to visualize positive staining material. For electron microscopy, small tissue specimens were directly fixed in glutaraldehyde in phosphate buffer, postfixed in osmium tetroxide, and embedded in resin. The contrast of ultrathin sections was enhanced by uranyl acetate and lead citrate.
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5

Comprehensive Immunohistochemistry and Western Blot Protocol

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Immunohistochemistry was performed using Dako’s Autostainerplus with the EnVisionFlex High pH-kit (DAKO, Glostrup, Denmark) with the following antibodies: CK5 (Novocastra, Wetzlar, Germany), CK14 (Novocastra), CK17 (DAKO), CK18 (DAKO), CK19 (DAKO), CK20 (DAKO), vimentin (DAKO), ERα (DAKO), Myb (Epitomics, San Francisco, CA). Western blot was performed as previously described [35] (link) using the following primary antibodies: caspase 3 (Cell Signaling Technology, Danvers, MA), β-actin (Santa Cruz Biotechnology, Santa Cruz, CA), Myb (Merck Millipore clone 1-1, Darmstadt, Germany), ERα (DAKO).
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6

Immunocytochemistry of Differentiated Cells

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Cells were grown on glass coverslips. One day post-confluent cells (day 0) were either washed in ice-cold PBS, fixed in 3.7% paraformaldehyde, and washed extensively in PBS, or induced to differentiate as above, followed by fixation on day 8. Coverslips were stored at −20 °C until use. For immunocytochemistry, cells were thawed at room temperature (RT) and washed 5 min in TBS followed by incubation with TBS, 0.5% Triton X-100 for 10 min and washed in TBS 2 × 5 min. Immunocytochemistry was performed using the EnVision FLEX High pH Kit (Dako, Denmark). Samples were blocked for 20 min in EnVision FLEX Peroxidase-Blocking Reagent (Dako) and incubated with primary antibody for 60 min at RT. The antibodies were diluted in Antibody Diluent (Dako) at 1:100 (MCT1) or 1:200 (MCT4). Next, samples were incubated with EnVision FLEX/HRP solution and stained with EnVision FLEX DAB + Chromogen (Dako). Between incubations, the samples were washed with EnVision FLEX washing buffer. Lastly, cells were counterstained with Mayer’s hematoxylin.
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7

Immunohistochemical Staining Protocol for Tissue Analysis

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Samples were stained with H&E, ERG, and PIN-4, and laser capture microdissected (LCM) as previously described (13 (link)). No differences were observed between H&E, ERG, and PIN-4 staining for tissues fixed in formalin versus PAXgene. For c-Myc and MAD automated immunohistochemical staining, 5 μm FFPE sections were baked for 1 hour at 60°C. After cooling to room temperature, antigen retrieval was performed using PT Link (Dako). Staining was with EnVision FLEX High pH kit (Dako, cat# K8000021-2) following the manufacturer's recommendations. Sections were incubated with 300 μL primary antibody (anti-c-Myc, Abcam cat# ab32072, 1:200 dilution; anti-MAD, Sigma-Aldrich cat# HPA001599, 1:1000 dilution) for 60 minutes at room temperature.
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8

Cervical Carcinoma in situ IHC Analysis

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IHC staining was performed on the formalin-fixed and paraffin-embedded tissue specimens of cervical carcinoma in situ, collected after conizations at the National Cancer institute of Lithuania. IHC staining was performed on the fully automated BenchMark ULTRA IHC/ISH Staining system (Roche) at the National Center of Pathology (Vilnius, Lithuania), using EnVision FLEX, High pH kit (Dako, Agilent, K8023, Santa Clara, CA, USA), affinity purified MAb H7 (0.02 mg/mL) and hematoxylin (Merck, 75290, Burlington, MA, USA) as a nuclear counterstain. Unrelated in-house PPV-targeting MAb of IgG1 isotype was used as negative control. Stained tissue sections were analyzed and photographed using ScanScope XT system (Aperio, Leica Biosystems Inc., Buffalo Grove, IL, USA).
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9

Quantifying IGF1R Expression in Tumor Tissues

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Immunohistochemical staining for IGF1R has been described previously (7 (link)). Briefly, TMA containing dual 1.0 mm cores from representative tumor regions from surgical specimens of formalin-fixed paraffin-embedded tissue blocks were constructed by a semi-automated tissue array device (Beeches instruments, Sun Prairie, WI, USA). The 4 µm thick sections were automatically deparaffinized and pretreated using the PT Link system (DAKO, Glostrup, Denmark). The sections were stained with anti-IGF1Rβ antibody (sc-713, Santa Cruz Biotechnology; dilution 1:150) using an Autostainer Plus from DAKO with EnVision FLEX high-pH kit according to the manufacturer’s instructions (DAKO, Glostrup, Denmark). Scoring was performed by two independent observers (Sofie Björner and Ann H. Rosendahl) and re-examination was performed in case of discrepancy (7.2%) until consensus was reached. A combined four level score of cytoplasmic and membrane staining intensity was used; negative, weak, moderate, strong. The highest score was applied in case of bilateral tumors (n = 15) and all scores came from the same tumor.
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10

CXCR7 Immunohistochemistry Protocol

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Formalin-fixed, paraffin-embedded cells were stained for CXCR7 (1:2,000 dilution with antibody 11G8 for detection) using the EnVision FLEX + High pH kit according to the manufacturer's instructions (Dako), and the procedure was conducted using the Autostainer Immunostaining System (Dako).
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